.travis.yml: add custom deploy step for 0.16.x
.travis.yml: add custom deploy step for 0.16.x

draegtun/ren-c,hostilefork/rebol,giuliolunati/ren-c,rgchris/ren-c,draegtun/ren-c,draegtun/ren-c,rgchris/ren-c,hostilefork/rebol,giuliolunati/ren-c,rgchris/ren-c,draegtun/ren-c,hostilefork/rebol,giuliolunati/ren-c,giuliolunati/ren-c,hostilefork/rebol,draegtun/ren-c,hostilefork/rebol,rgchris/ren-c,draegtun/ren-c,hostilefork/rebol,rgchris/ren-c,giuliolunati/ren-c